Pipe-damper



(No Model.)

M. J. LIDDELL. PIPE DAMPER.

Patented July 16, 18 89.

UNITED STATES PATENT OFFICE.

MARK J. LIDDELL, OF MOUNT PLEASANT, MICHIGAN.

PIPE-DAMPER.

SPECIFICATION forming part of Letters Patent No. 407,082, dated July 16, 1889.

Application filed November 9, 1888. Serial No. 290,349- (No model.)

To aZZ whom it ntay concern.-

Be it known that I, llIARK J. LIDDELL, of Mount Pleasant, in the county of Isabella and State of Michigan, have invented a new and Improved Pipe-Damper, of which the following is a full, clear, and exact description.

My invention relates to a damper for pipes or flues carrying off the products of combustion from stoves, heaters, or furnaces; and the invention has for its'object to provide a simple, inexpensive, and efficient damper of this character by which the draft through the pipe may be perfectly controlled.

The invention will first be particularly described, and then will be pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a vertical sectional view of a stove-pipe drum of my invention, and with the improved damper applied thereto and shown open and in transverse section. Fig. 2 is a plan view of the drum, showing the pipe-damper closed. Fig. 3 is a detail side view showing the dam per-operatin g and latch devices, and Fig. 4 is a side view partly broken away and in section and taken at right angles to the same parts shown in Fig.

The drawings show my improved damper applied to the main central draft pipe or flue of a stove-pipe drum, for which Letters Patent No. 391,5ll, dated October 23, 1888, have recently been granted to me; but the damper is applicable to the pipe or draft-flue of any stove, heater, or furnace.

I will first particularly describe the damper, and then briefly refer to the operation of it relatively to the stove-pipedrum.

The damper, as shown, consists of two semicircular plates A A, each of which is pivoted at its inner straight edge by a pin B to the drum-pipe D. One end of the pivot-pin B of each damper-plate is provided with an arm Z), which may be a part of the pin bent outward at about a right angle, or may be a separate piece fixed to the pin. To the extremity of the bent arm I) of one damper-plate pin Bis pivoted one end of a semicircular bar O, preferably having some inherent elasticity, and the other end of this bar enters an eye or loop 1), formed at the extremity of the arm I) of the other damper-plate pivot-pin, and is provided at its outeredge with aseries of detents made, preferably, in the form of notches 0, either of which may be engaged with the eye or loop I) for holding the damper-plates A A closed, as shown in Figs. 2, 3, and 4 of the drawings, or for holding the plates open more or less, as occasion may require. The elasticity of the latch-bar 0 holds any one of its detents or notches in engagement with the eye or loop I), and also permits the quick and easy disengagement of the latch-bar when it is desired to readjust it or to close or open it more or less from the position it last occupied and as the draft of the stove, heater, or furnace may require.

It will be noticed that the damper-plates A A are fixed to their pivot pins or shafts B l in a manner causing the pivot-arms I) I) to lie in the plane of the plates; hence the plates always move with the arms, and the arms are an unfailing index to the positions of the hidden damper-plates and assure correct adjustments of the damper.

I am not limited to a pair of plates of semi circular form and pivoted at contiguous edges, as the plates may have any marginal shape as the pipe or flue to which the damper is to be fitted may require. Neither am 1 limited to the detent-notches o in the latch-bar O of the plates, as equivalent studs or pins may be used to lock with an eye, loop, or pin at the free end or part of the latch-bar.

The stove-pipe drum to which I herein apply the damper is made with an outer drum E, which has tapering upper and lower ends and a detachable lower part or base 6, to which the lower pipe-section F is connected, the up- -per pipe-section Gbeing connected to the top of the pipe I), which projects through the drum. Brackets h support an inner drum .ll, having a closed and preferably a separable bottom from the base 6 of the outer drum; and a lower short pipe d, which is set about in alignment with the pipe D and forms practically a continuation thereof, is provided with an ordinary pivoted damper I, having a stem 2' in reach of the operator. On the pipe D is fitted a sliding damper J, to which is connected arod or stem K, which extends through the top of the drum, and may be lowered or raised to close or'o'pen the passage at d between the ends of the pipes D d. \Vhen the damper I is closed and the one J is open, as shown in Fig. 1 of the drawings, there will be an indirect draft from the pipe F to and through the passage d to the pipesD G, and thence to the fine with which the pipes connect. When the damper I is open and the one J is closed, there will be a direct draft through the pipes F, d, -D, and G to the flue, and in either case the pipe-damper plates A A may be adjusted to control the draft of the stove, heater, or furnace, whose products of combustion pass off through the drum.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A pipe-damper consisting of two plates pivoted at contiguous edges and a latch device connected to the plate-pivots and adapted to hold the plates at any required adjustment, substantially as herein set forth.

2. A pipe-damper consisting of. two plates pivoted at contiguous edges, arms on the platepivots, and a latch-bar pivoted to the arm of one plate and engaging the arm of the other plate, substantially as herein set forth.

3. A pipe-damper consisting of two plates pivoted at contiguous edges, arms on the platepivots ranging in the same plane as the plates, and a latch device held to the arm of one plate and engaging the arm of the other plate, substantially as herein set forth.

4. A pipe-damper consisting of two plates pivoted at contiguous edges, the plate-pivots provided with arms ranging at right angles, and a semicircular latch-bar pivoted to the end of one arm and provided with detents adapted to engage the extremity of the other arm, substantially as herein set forth.

5. The combination, in a pipe-damper, of a pair of plates A A, pivoted by pins or shafts B B to and within a pipe, said pivots having arms I) 1') outside the pipe, one arm being provided with an eye or loop I), and a curved latch-bar O, pivoted to the end of the other arm and provided with a series of notches or detents adapted to engage said eye or loop I), substantially as herein set forth.

MARK J. LIDDEL'L.

WVitness'es:

LEVI A. CRANE, WILLIAM TAYLOR. 

